Here are some good video's describing basic Analog Switch parameters. It will help with understanding datasheets specifications.
VT1001: Basic Structure of a CMOS Switch | Analog Devices
VT1002: RON Switch On Resistance | Analog Devices
VT1003: Switch Capacitance and Leakage | Analog Devices
VT1004: Switch Charge Injection | Analog Devices
VT1005: Switch AC Parameters and Timing Specifications | Analog Devices